Seat adjustment structure and child safety seat

ABSTRACT

A seat adjustment structure for adjusting a relative position between a seat and a base carrying the seat is provided. The seat adjustment structure is slidable with respect to the base along a longitudinal centerline, and includes: a pair of engaging members, fixed to one of the base or the seat with respect to the longitudinal centerline; a locking assembly, fixed to the other of the base or the seat, the locking assembly lockable to or unlockable from the engaging member; an operating member movable with respect to the seat along a vertical direction; and a cable, connecting the operating member and the locking assembly, and arranged to transmit a vertical movement of the operating member to the locking assembly, thereby causing the locking assembly to be locked or unlocked with respect to the engaging member to lock or unlock the base with respect to the seat.

TECHNICAL FIELD

The present application relates to a seat adjustment structure, and achild safety seat comprising the seat adjustment structure.

BACKGROUND

A child safety seat is a common device on which can be seated infants ofdifferent ages. The child safety seat is designed for safety of childrenwhile travelling, which can restrain children's dangerous behavior in acar during travelling and protect children from harm in case ofaccidents such as collisions.

The child safety seat is generally provided with a seat tilt angleadjustment structure, which can adjust the seat to an upright or lyingstate according to the needs of the child. However, a normal seat tiltangle adjustment structure usually has a complicated design, which leadsthe child safety seat to have problems of difficult assembling andincreased cost.

Moreover, in some uses, the child safety seat needs to have adjustmentfunctions in both fore and aft directions. That is, the seat needs to berotatable about a generally vertical axis, such that the seat may faceforward, rearward, or sideways. Under such circumstances, a new demandis raised for the tilt angle adjustment structure of the child safetyseat: the tilt angle adjustment structure needs to have a more flexibleoperation mode, to allow the user to easily adjust the tilt angle of theseat while the seat is facing in any direction.

SUMMARY

According to the application, a seat adjustment structure for adjustinga relative position between a seat and a base carrying the seat isprovided. The seat adjustment structure is capable of sliding withrespect to the base along a longitudinal centerline, and includes: onepair of engaging members, symmetrically fixed to one of the base and theseat with respect to the longitudinal centerline; a locking assembly,fixed to the other of the base and the seat, the locking assembly iscapable of being locked to or unlocked from the engaging member; anoperating member, mounted on the seat or the base, and capable of movingwith respect to the seat along a vertical direction; and a cable,connecting the operating member and the locking assembly, and beingarranged to transmit a vertical movement of the operating member to thelocking assembly, thereby causing the locking assembly to be locked orunlocked with respect to the engaging member, such that the base islocked or unlocked with respect to the seat.

According to the application, a child safety seat is provided,including: a seat for a passenger to sit; a base for fixing the childsafety seat to a vehicle; and the seat adjustment structure according tothe application, disposed between the seat and the base; wherein theseat includes a rotating disk, the rotating disk is arranged on a sideof the seat facing the base, and the rotating disk is capable ofrotating with respect to the base through a vertical pivoting shaftlocated on its longitudinal centerline; and the seat adjustmentstructure is connected to the rotating disk, so as to be arranged abovethe rotating disk in a manner capable of sliding with respect to therotating disk along the longitudinal centerline.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the application will be specifically described below inconjunction with the accompanying drawings, in which:

FIG. 1A is a side view of a child safety seat according to theapplication, in which the seat is in an approximately upright position;

FIG. 1B is another side view of the child safety seat according to theapplication, in which the seat is in a position tilted to a certainextent;

FIG. 2 is a perspective view of the child safety seat according to theapplication;

FIG. 3A is a perspective view of the child safety seat according to theapplication, in which a surface of the seat is removed to show a seatadjustment structure below the surface;

FIG. 3B is a partial enlarged view of FIG. 3A;

FIG. 4 is a perspective view of a locking assembly of the seatadjustment structure according to the application;

FIG. 5 is a perspective view of the locking assembly of the seatadjustment structure according to the application, in which apositioning cover of the locking assembly is removed to show an engagingpin and a resetting elastic member covered and shielded by thepositioning cover;

FIG. 6A is a side sectional view of the child safety seat according tothe application, in which the seat is in a forward-facing position; FIG.6B is another side sectional view of the child safety seat according tothe application, in which the seat is in a rearward-facing position; and

FIG. 7 is a perspective view of an operating member according to theapplication.

DETAILED DESCRIPTION

Although the disclosure is illustrated and described herein withreference to specific embodiments, the disclosure should not be limitedto the illustrated details. Specifically, various modifications may bemade in these details within the scope of equivalents of the claims andwithout departing from the disclosure.

Directional expressions such as “front,” “rear,” “up,” and “down”involved in this document are only used for the convenience ofunderstanding, and the disclosure is not limited to these directions,but can be adjusted according to the actual situation.

A child safety seat according to the application will be generallydescribed by referring to FIGS. 1A-2 .

As shown, the child safety seat includes a base 300 and a seat 200. Thebase 300 is a part that fixes the entire child safety seat to, forexample, a rear seat of a car, and the seat 200 is carried on the base300 and is used for a child to sit. The seat 200 is mounted on the base300 through a seat adjustment structure 100, and more specifically, on arotating disk 310 (see FIG. 3A-3B) located at an upper surface of thebase 300. An entire mounting sequence of the child safety seat from topto bottom is roughly the seat 200, the seat adjustment structure 100,and the rotating disk 310, and the base 300. In the application, theseat adjustment structure 100 allows the seat 200 to move with respectto the base 300 in a front-rear direction. Since the seat adjustmentstructure 100 is mounted on the rotating disk 310, the rotating disk 310allows the seat 200 to rotate with respect to the base 300 around alongitudinal axis. However, it should be understood, the seat adjustmentstructure 100 of the application is not necessarily to cooperate withthe rotating disk 310, but may be connected to the base 300 throughother rotating structure(s) or directly fixed to the base 300.

Now the seat adjustment structure 100 of the application will bedescribed in more detail by referring to FIG. 3A-3B

As shown, the seat adjustment structure 100 includes a plurality ofcomponents such as an operating member 110, a seat support 120, engagingmembers 130, and a locking assembly 140. The operating member 110 is acomponent located outside the seat 200 for the user to operate. The seatsupport 120 is a component fixed to the seat 200 for carrying the seat200. The engaging members 130 each are a component fixed to the base300. The locking assembly 140 is fixed to the seat support 120, and isused to lock and unlock a positional relationship between the seatsupport 120 and the engaging members 130. The operating member 110 isconnected to the locking assembly 140 through a cable 190, such that theuser can operate the locking assembly 140. In other embodiments, theengaging members 130 may be fixed to the seat support 120, and thelocking assembly 140 may be fixed to the base 300.

The operating member 110 is a handle that is inserted into the seat 200and can move vertically (see FIGS. 6A-7 ). The cable 190 is connectedbetween the operating member 110 and the locking assembly 140. A guidingmember is disposed below the operating member 110 to guide the cable 190connecting from below the seat 200 to the locking assembly 140 along anarc, and a structure inside the locking assembly 140 can convert alongitudinal motion of the cable 190 (will be described in detail below)to a lateral movement (Y-axis direction). In this way, a verticalmovement of the operating member 110 is finally converted into a lateralmovement of a locking pin in the locking assembly 140.

The seat support 120 is a tubular component that extends from a bottomof the seat 200 to a back of the seat 200 along an arc trajectory. Inthis embodiment, the seat support 120 extends substantially horizontally(i.e., extends longitudinally) at the bottom of the seat 200, andgradually transits to extending substantially vertically at the back ofthe seat 200. In this embodiment, two seat supports 120 are arranged,and they are arranged in parallel on both left and right sides of theseat 200. It should be understood, shape and number of the seat support120 can be set according to specific requirements of the seat 200, andare not limited to the shape and number in the embodiments of theapplication.

Each of the engaging members 130 is a sheet-like component that is fixedto the base 300, and includes two side plates 131 extendingsubstantially along an inner direction of the seat support 120 andhaving a length smaller than that of the seat support 120. In thisembodiment, two pairs of engaging members 130 are arranged, where onepair of engaging members 130 is arranged at positions on the bottom ofthe seat 200 and thus extends substantially longitudinally; and theother pair of engaging members 130 is arranged at positions on the backof the seat 200 and thus extending substantially vertically. In otherembodiments, only one pair of engaging members 130 may be arranged. Inthis embodiment, the locking assembly 140 is only disposed on theengaging members 130 at positions on the bottom, and in otherembodiments, the locking assembly 140 may be disposed on each pair ofengaging members 130.

Several engaging holes 132 are formed on one of the side plates 131 ofeach engaging member 130. The engaging holes 132 are arranged along amoving direction (i.e., the longitudinal direction) of the seat 200, andspacing between the engaging holes 132 is arranged so that the engagingholes 132 are suitable for being simultaneously inserted by two footportions 171 (see FIG. 4-5 ) of an engaging pin 170 in the lockingassembly 140. Sliding slots 133 are arranged above the engaging holes132. Extending direction of the sliding slots 133 are as same asarrangement directions of the engaging holes 132, and widths of thesliding slots 133 are suitable for being inserted by a crossbar 180therein. In other embodiments, the sliding slots 133 may also bearranged below the engaging holes 132.

The locking assembly 140 is a box-shaped component that extends betweena pair of engaging members 130. The crossbar 180 laterally passesthrough and is secured to the locking assembly 140, and extends outwardfrom both lateral sides of the locking assembly 140. Both ends of thecrossbar 180 are fixed to the seat support 120 by passing through thesliding slots 133 on the engaging members 130. In this way, relativesliding between the engaging members 130 and the locking assembly 140 isallowed through the crossbar 180 and the sliding slots 133, and slidingtrajectories of the engaging members 130 are defined.

The rotating disk 310 is below the engaging members 130. The rotatingdisk 310 is connected to the base 300 through a vertical pivoting shaft320, so as to rotate around the vertical direction.

In this way, the rotating disk 310 realizes a rotation function of theseat 200, the seat adjustment structure 100 realizes a movement functionof the seat 200 along the extending direction of the seat support 120.In the present embodiment, the extending direction of the seat support120 is an arc, and in other embodiments, the extending direction of theseat support 120 may also be a straight line or in other forms.

Specific structure of the locking assembly 140 will be described byreferring to FIGS. 4-5 .

As shown, the locking assembly 140 includes a fixed seat 160, apositioning cover 150, a pair of engaging pins 170, resetting elasticmembers 175, and reinforcing members 166.

The fixed seat 160 extends laterally and includes a bottom wall 161, twoside walls 163 on both sides of the lateral direction, and two end walls162 on both ends of the lateral direction, thereby defining anaccommodating space. A cable hole 165 for the cable 190 to passlongitudinally into the accommodating space is disposed at a lateralmiddle of one of the side walls 163 of the fixed seat 160. Each of theend walls 162 is provided with pin holes 164 and crossbar holes 167.Among them, two pin holes 164 are provided, which are located at lowerparts of the end walls 162 and distributed in the longitudinaldirection; and two crossbar holes 167 are provided, which are located atupper parts of the end walls 162 and corresponding to the middlepositions of the two pin holes 164.

The positioning cover 150 is mounted on the fixed seat 160 and coversthe accommodating space. The positioning cover 150 is substantiallyparallel to the bottom wall 161 of the fixed seat 160 and is positionedbetween the pin holes 164 and the crossbar holes 167 in the verticaldirection. A side of the positioning cover 150 facing the bottom wall161 is provided with cable guiding portions (not shown) for guiding thecable 190 to extend laterally.

Each of the engaging pins 170 is approximately U-shaped and includes aconnecting portion 172 and two foot portions 171. The foot portions 171respectively extend in the lateral direction, are inserted into the pinholes 164 in the lateral end walls 162 of the fixed seat 160, and canprotrude from the locking assembly 140 in order to be inserted into thecorresponding engaging holes 132. The connecting portion 172 isconnected between the two foot portions 171 and located in theaccommodating space, so as to locate the engaging pins 170 in thelocking assembly 140.

Each of the resetting elastic members 175 has one end abutting on thefixed seat 160 of the locking assembly 140 or the positioning cover 150,and the other end abutting against the connecting portion 172, to applya thrust to the engaging pins 170 for them to protrude outward from thelocking assembly 140. In this way, the engaging pins 170 tend toprotrude from the locking assembly 140.

The reinforcing members 166 are attached to outer sides of the end walls162 of the fixed seat 160, to strengthen the structure of the lockingassembly 140.

One end of the cable 190 is connected to the operating member 110, andthe other end of the cable 190 is divided into two branch cables 190after passing through the cable hole 165. Furthermore, the two branchcables 190 extend laterally via respective cable guiding portions andare connected to the corresponding engaging pins 170. The cable guidingportions are disposed on the side of the positioning cover 150 facingthe bottom wall 161. In an embodiment, the cable guiding portions areimplemented as cable grooves, and the cable grooves are approximatelyquarter-circular arc grooves extending curved from the cable hole 165towards the engaging pins 170 for accommodating the branch cables 190and defining movement trajectories of the branch cables 190. In anotherembodiment, the cable guiding portions are implemented as pulleysrotatable around a vertical axis for carrying the branch cables 190 toturn the branch cables 190 from the longitudinal direction to thelateral direction.

In this way, through transmission of the cable 190, when the user pullsthe operating member 110 upwards, the engaging pins 170 will retractinto the locking assembly 140, thereby unlocking the positionalrelationship between the locking assembly 140 and the engaging members130, to allow a longitudinal relative movement between the seat 200 andthe base 300. When the user releases the operating member 110, theengaging pins 170 will protrude from the locking assembly 140 to beinserted into the engaging members 130, thereby locking the longitudinalrelative movement between the seat 200 and the base 300.

Referring to FIGS. 6A-6B, advantages of the seat adjustment structure ofthe application will be described.

In FIG. 6A, the seat 200 is at a position facing the front of the base300 (right in the figure), and in FIG. 6B, the seat 200 is at a positionfacing the rear of the base 300 (left in the figure). It can be seen, nomatter which direction the seat 200 is rotated to face, the user caneasily pull the operating member 110 to unlock the longitudinal relativemovement between the seat 200 and the base 300. However, in some designsof the prior art, since the operating member connected to the lockingassembly is designed to be in the same direction as the moving directionof the seat, i.e., the user has to pull or push the operating memberalong the longitudinal direction, accordingly, when the seat is facingsrearward, the user's pulling or pushing of the operating member mayinterfere with the backrest of the rear seat of the car, so it may bedifficult for the user to use the operating member.

The positional relationship between the locking assembly 140 and theengaging members 130 can also be seen from FIGS. 6A-6B. Since eachengaging member 130 is provided with a plurality of engaging holes 132,the locking assembly 140 can lock the seat 200 at different positions inthe longitudinal direction.

According to the application, a seat adjustment structure for adjustinga relative position between a seat and a base carrying the seat isprovided. The seat adjustment structure is capable of sliding withrespect to the base along a longitudinal centerline, and includes: onepair of engaging members, symmetrically fixed to one of the base and theseat with respect to the longitudinal centerline; a locking assembly,fixed to the other of the base and the seat, the locking assembly iscapable of being locked to or unlocked from the engaging member; anoperating member, mounted on the seat or the base, and capable of movingwith respect to the seat along a vertical direction; and a cable,connecting the operating member and the locking assembly, and beingarranged to transmit a vertical movement of the operating member to thelocking assembly, thereby causing the locking assembly to be locked orunlocked with respect to the engaging member, such that the base islocked or unlocked in respect to the seat.

In an embodiment, several engaging holes are formed on each of theengaging members; the locking assembly is provided with a pair ofengaging pins, the engaging pins are capable of being extended andretracted along a lateral direction perpendicular to the longitudinalcenterline, thereby being extended and inserted into the correspondingengaging holes to lock the locking assembly to the engaging members, orretracted from the corresponding engaging holes to unlock the lockingassembly from the engaging members; and the cable connects the operatingmember and the engaging pins, and is arranged to be capable oftransmitting the vertical movement of the operating member to theengaging pins, such that the engaging pins are capable of being extendedand retracted.

In an embodiment, the seat adjustment structure further comprises acrossbar which is arranged corresponding to the engaging members, thecrossbar extends along the lateral direction and is fixed to one of thebase and the seat; the engaging members are respectively provided withsliding slots defining a sliding trajectory, and the crossbar passesthrough the sliding slots, such that when the seat slides with respectto the base, the crossbar slides with respect to the sliding slots alongthe sliding trajectory.

In an embodiment, the engaging members include a pair of parallel sideplates, and the several engaging holes are arranged on one side of thesliding slots at regular intervals along the sliding trajectory.

In an embodiment, the locking assembly is located between the engagingmembers, and includes: a fixed seat extending along the lateraldirection to define an accommodating space with the crossbar passingthrough the fixed seat; and a positioning cover mounted on the fixedseat to cover the accommodating space; wherein the two engaging pins arerespectively arranged in the accommodating space, and arranged at twolateral end walls of the fixed seat, and capable of extending out of thefixed seat to be inserted into the engaging holes or separating from theengaging holes to be retracted into the fixed seat.

In an embodiment, the fixed seat of the locking assembly is providedwith a cable hole for the cable to pass longitudinally into theaccommodating space, and the cable hole is disposed at a centralposition of a side wall of the fixed seat facing the operating member; aside of the positioning cover facing a bottom wall of the fixed seat isprovided with cable guiding portions for guiding the cable to extendlaterally; and one end of the cable is connected to the operatingmember, and the other end of the cable is divided into two branch cablesafter passing through the cable hole, the two branch cables extendlaterally via their respective cable guiding portions and are connectedto the corresponding engaging pins.

In an embodiment, the engaging pins are approximately U-shaped andinclude: two foot portions, respectively extending along the lateraldirection and inserted into the lateral end walls of the fixed seat, andbeing capable of protruding from the locking assembly in order to beinserted into the corresponding engaging holes; and a connectingportion, connected between the two foot portions and located in theaccommodating space.

In an embodiment, the locking assembly further includes resettingelastic members, each of the resetting elastic members has one end fixedon the fixed seat or the positioning cover of the locking assembly, andthe other end abutting against the connecting portion, so as to apply athrust to the engaging pins for them to protrude outward from thelocking assembly.

In an embodiment, reinforcing members are respectively fixed on outersides of the two lateral end walls of the fixed seat.

In an embodiment, the cable guiding portions are cable grooves, and thecable grooves are approximately quarter-circular arc grooves extendingcurved from the cable hole towards the engaging pins for accommodatingthe branch cables and defining movement trajectories of the branchcables; or the cable guiding portions are pulleys rotatable around avertical axis for carrying the branch cables to turn the branch cablesfrom the longitudinal direction to the lateral direction.

In an embodiment, the engaging members are fixed on the base; and thelocking assembly is fixed on the seat via the crossbar.

According to the application, a child safety seat is provided,including: a seat for a passenger to sit; a base for fixing the childsafety seat to a vehicle; and the seat adjustment structure according tothe application, disposed between the seat and the base; wherein theseat includes a rotating disk, the rotating disk is arranged on a sideof the seat facing the base, and the rotating disk is capable ofrotating with respect to the base through a vertical pivoting shaftlocated on its longitudinal centerline; and the seat adjustmentstructure is connected to the rotating disk, so as to be arranged abovethe rotating disk in a manner capable of sliding with respect to therotating disk along the longitudinal centerline.

In an embodiment, the rotating disk has an arc surface along an arcbetween a bottom and a backrest of the seat, the arc surface includes anapproximately horizontal portion and an approximately vertical portion.

The seat adjustment structure further includes another pair of engagingmembers and another crossbar, the pair of engaging members and thecrossbar are located at a horizontal portion of the rotating disk, andanother pair of engaging members and another crossbar are located at avertical portion of the rotating disk.

Although the disclosure has been provided by with reference to typicalembodiments, the terms used are illustrative and exemplary rather thanrestrictive. Since the disclosure can be implemented in various formswithout departing from the spirit and essence of the disclosure, itshould be understood, the above-mentioned embodiments are not limited toany of the foregoing details, but shall be interpreted in the broadestsense within the scope defined by the claims. Therefore, any variationfalling within the scope of the claims or their equivalents shall becovered by the claims.

LIST OF REFERENCE SIGNS

-   -   100 Seat Adjustment Structure        -   110 Operating member        -   120 Seat Support        -   130 Engaging Member            -   131 Side Plate            -   132 Engaging Hole            -   133 Sliding Slot        -   140 Locking Assembly        -   150 Positioning Cover        -   160 Fixed seat            -   161 Bottom Wall            -   162 End Wall            -   163 Side Wall            -   164 Pin hole            -   165 Cable hole            -   166 Reinforcing Member            -   167 Crossbar Hole        -   170 Engaging Pin            -   171 Foot Portion            -   172 Connecting Portion        -   175 Resetting Elastic Member        -   180 Crossbar        -   190 Cable    -   200 Seat    -   300 Base        -   310 Rotating Disk        -   320 Vertical Pivoting Shaft    -   M Longitudinal Centerline    -   X Longitudinal Direction (Front-Rear Direction)    -   Y Lateral Direction (Left-Right Direction)    -   Z Vertical Direction (Up-Down Direction)

What is claimed is:
 1. A seat adjustment structure for adjusting arelative position between a seat and a base carrying the seat, whereinthe seat adjustment structure is capable of sliding with respect to thebase along a longitudinal centerline and comprises: one pair of engagingmembers, fixed to one of the base and the seat with respect to thelongitudinal centerline; a locking assembly, fixed to the other of thebase and the seat, capable of being locked to or unlocked from theengaging member; an operating member, mounted on the seat or the base,capable of moving with respect to the seat along a vertical direction;and a cable, connecting the operating member and the locking assembly,and being arranged to transmit a vertical movement of the operatingmember to the locking assembly, thereby causing the locking assembly tobe locked or unlocked with respect to the engaging members, such thatthe base is locked or unlocked with respect to the seat.
 2. The seatadjustment structure according to claim 1, wherein: several engagingholes are formed on each of the engaging members; the locking assemblyis provided with a pair of engaging pins, the engaging pins are capableof being extended and retracted along a lateral direction perpendicularto the longitudinal centerline, thereby being extended and inserted intothe corresponding engaging holes to lock the locking assembly to theengaging members, or retracted from the corresponding engaging holes tounlock the locking assembly from the engaging members; and the cableconnects the operating member and the engaging pins, and is arranged tobe capable of transmitting the vertical movement of the operating memberto the engaging pins, such that the engaging pins are capable of beingextended and retracted along the lateral direction.
 3. The seatadjustment structure according to claim 2, further comprising: acrossbar arranged corresponding to the engaging members, the crossbarextending along the lateral direction and being fixed to one of the baseand the seat; wherein the engaging members are respectively providedwith sliding slots, and the crossbar passes through the sliding slots,such that when the seat slides with respect to the base, the crossbarslides with respect to the sliding slots along the sliding trajectory.4. The seat adjustment structure according to claim 3, wherein: theengaging members comprise a pair of parallel side plates, and theseveral engaging holes are arranged on one side of the sliding slots atregular intervals along the sliding trajectory.
 5. The seat adjustmentstructure according to claim 4, wherein: the locking assembly is locatedbetween the engaging members, and comprises: a fixed seat extendingalong the lateral direction to define an accommodating space with thecrossbar passing through the fixed seat; and a positioning cover mountedon the fixed seat to cover the accommodating space; wherein, the twoengaging pins are respectively arranged in the accommodating space, andarranged at two lateral end walls of the fixed seat, and capable ofextending out of the fixed seat to be inserted into the engaging holesor separating from the engaging holes to be retracted into the fixedseat.
 6. The seat adjustment structure according to claim 5, wherein:the fixed seat of the locking assembly is provided with a cable hole forthe cable to pass longitudinally into the accommodating space, and thecable hole is disposed at a central position of a side wall of the fixedseat facing the operating member; a side of the positioning cover facinga bottom wall of the fixed seat is provided with cable guiding portionsfor guiding the cable to extend laterally; and one end of the cable isconnected to the operating member, and the other end of the cable isdivided into two branch cables after passing through the cable hole, thetwo branch cables extend laterally via their respective cable guidingportions and are connected to the corresponding engaging pins.
 7. Theseat adjustment structure according to claim 6, wherein: the engagingpins are approximately U-shaped and comprise: two foot portions,respectively extending along the lateral direction and inserted into thelateral end walls of the fixed seat, and being capable of protrudingfrom the locking assembly in order to be inserted into the correspondingengaging holes; and a connecting portion, connected between the two footportions and located in the accommodating space.
 8. The seat adjustmentstructure according to claim 7, wherein: the locking assembly furthercomprises resetting elastic members, each of the resetting elasticmembers has one end fixed on the fixed seat or the positioning cover ofthe locking assembly, and the other end abutting against the connectingportion, so as to apply a thrust to the engaging pins for them to beprotruded outward from the locking assembly.
 9. The seat adjustmentstructure according to claim 8, wherein: reinforcing members arerespectively fixed on outer sides of the two lateral end walls of thefixed seat.
 10. The seat adjustment structure according to claim 6,wherein: the cable guiding portions are cable grooves, and the cablegrooves are approximately quarter-circular arc grooves extending curvedfrom the cable hole towards the engaging pins for accommodating thebranch cables and defining movement trajectories of the branch cables;or the cable guiding portions are pulleys rotatable around a verticalaxis for carrying the branch cables to turn the branch cables from thelongitudinal direction to the lateral direction.
 11. The seat adjustmentstructure according to claim 3, wherein: the engaging members are fixedon the base; and the locking assembly is fixed on the seat via thecrossbar.
 12. A child safety seat comprising: a seat; a base for fixingthe child safety seat to a vehicle; and the seat adjustment structureaccording to claim 1, disposed between the seat and the base; whereinthe seat comprises a rotating disk, the rotating disk is arranged on aside of the seat facing the base, and the rotating disk is capable ofrotating with respect to the base through a vertical pivoting shaftlocated on its longitudinal centerline; and the seat adjustmentstructure is connected to the rotating disk, so as to be arranged abovethe rotating disk in a manner capable of sliding with respect to therotating disk along the longitudinal centerline.
 13. The child safetyseat according to claim 12, wherein: the rotating disk has an arcsurface along an arc between a bottom and a backrest of the seat, thearc surface comprises an approximately horizontal portion and anapproximately vertical portion; and the seat adjustment structurefurther comprises another pair of engaging members and another crossbar,the pair of engaging members and a crossbar arranged corresponding tothe engaging members are located at a horizontal portion of the rotatingdisk, and the other pair of engaging members and the other crossbar arelocated at a vertical portion of the rotating disk.
 14. A seatadjustment structure for adjusting a relative position between a seatand a base carrying the seat, wherein the seat adjustment structure isslidable with respect to the base along a longitudinal centerline andthe seat adjustment comprises: an operating member, mounted on the seator the base, movable with respect to the seat along a verticaldirection; a pair of engaging members, fixed to the base or the seatwith respect to the longitudinal centerline; a locking assembly, fixedto the other of the base or the seat, capable of being locked to orunlocked from at least one of the pair of engaging members; and a cable,connecting the operating member and the locking assembly, and beingarranged to transmit a vertical movement of the operating member to thelocking assembly, thereby causing the locking assembly to be locked orunlocked with respect to the pair of engaging members to lock or unlockthe base with respect to the seat.
 15. The seat adjustment structureaccording to claim 14, wherein: each of the engaging members has atleast one engaging hole formed therein; the locking assembly has a pairof engaging pins, the engaging pins are capable of being extended andretracted along a lateral direction perpendicular to the longitudinalcenterline, thereby being extended and inserted into a correspondingengaging hole to lock the locking assembly to the engaging members, orretracted from the corresponding engaging hole to unlock the lockingassembly from the engaging members; and the cable connects the operatingmember and the engaging pins, and is arranged to be capable oftransmitting the vertical movement of the operating member to theengaging pins, such that the engaging pins are capable of being extendedand retracted along the lateral direction.
 16. The seat adjustmentstructure according to claim 15, further comprising: a crossbar arrangedcorresponding to the engaging members, the crossbar extending along thelateral direction and being fixed to one of the base or the seat;wherein the engaging members include corresponding sliding slots, andthe crossbar passes through the sliding slots, such that when the seatslides with respect to the base, the crossbar slides with respect to thesliding slots along the sliding trajectory.
 17. The seat adjustmentstructure according to claim 16, wherein: the engaging members comprisea pair of parallel side plates, and the at least one engaging hole isarranged on one side of the sliding slots at regular intervals along thesliding trajectory.
 18. The seat adjustment structure according to claim17, wherein: the locking assembly is located between the engagingmembers, and comprises: a fixed seat extending along the lateraldirection to define an accommodating space with the crossbar passingthrough the fixed seat; and a positioning cover mounted on the fixedseat to cover the accommodating space; wherein, the two engaging pinsare correspondingly arranged in the accommodating space, and arranged attwo lateral end walls of the fixed seat, and capable of extending out ofthe fixed seat to be inserted into the engaging holes or separating fromthe engaging holes to be retracted into the fixed seat.
 19. The seatadjustment structure according to claim 18, wherein: the fixed seat ofthe locking assembly has formed therein a cable hole for the cable topass longitudinally into the accommodating space, and the cable hole isat a central position of a side wall of the fixed seat facing theoperating member; a side of the positioning cover facing a bottom wallof the fixed seat has cable guiding portions for guiding the cable toextend laterally; and one end of the cable is connected to the operatingmember, and the other end of the cable is divided into two branch cablesafter passing through the cable hole, the two branch cables extendlaterally via their corresponding cable guiding portions and areconnected to the corresponding engaging pins.
 20. The seat adjustmentstructure according to claim 19, wherein: the engaging pins areapproximately U-shaped and comprise: two foot portions, correspondinglyextending along the lateral direction and inserted into the lateral endwalls of the fixed seat, and are capable of protruding from the lockingassembly in order to be inserted into the corresponding engaging holes;and a connecting portion, connected between the two foot portions andlocated in the accommodating space.